Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd2f16426f5e344…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 09:02:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: abe324a24490f18d2f10ca2189623e55 SHA-1: 563934506b901d843207e0dd5d141d245d8312e5 SHA-256: 3fd2f16426f5e344f9abcfc8f945bca3e9380a422463f1ad4bca108a5a2f2382
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded URLs, many of which are structured as SEO-optimized links pointing to game-related content like 'robux' and 'coin master'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly flags it as malicious. The document likely serves as a lure to drive users to download or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/robux-withdraw-game-hack
    • http://library.stieyapan.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/10-free-spins-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/best-free-roblox-outfits_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-free-link-today_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-invite-friends-hack_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/www-roblox-com-robux-free_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/bux-life-free-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/pokemon-go-free-app_GM1094591345.pdf
    • http://library.stieyapan.ac.id//repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/www-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/roblox-games-with-free-radio_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/pubg-uc-global_GM1330123889.pdf
    • http://library.stieyapan.ac.id/repository/robux-com-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030db.bin
2b4ce59a1d640d0ead81239d859a33f6acdf8fe1f25e9921c0c71b7f1863bf1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30DB 22124 bytes
font_01_sfnt_off000061b3.bin
de7b824c09f735eb534751a8b52ce9a3732249b778a238cd25bbd76ceacef318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B3 19476 bytes

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